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Fixed-asset Impairment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 MW	Dec. 31, 2012	Dec. 31, 2014
Carrying Value	$ 2,534.2us-gaap_PropertyPlantAndEquipmentNet		$ 2,517.6us-gaap_PropertyPlantAndEquipmentNet
Conesville [Member]
Fair Value	0
Fixed asset impairment	26.2
Production Plan Capacity	129
Conesville [Member] \| DP&L [Member]
Fair Value	0	25.0
Carrying Value	30.0	97.5
Fixed asset impairment	10.0	72.5
Production Plan Capacity	129
East Bend Station [Member]
Fair Value	2.7
Carrying Value			14.2
Fixed asset impairment	11.5
East Bend Station [Member] \| DP&L [Member]
Carrying Value	76.0
Fixed asset impairment	76.0
Production Plan Capacity	186
Hutchings Plant [Member] \| DP&L [Member]
Fair Value		0
Carrying Value		8.3
Fixed asset impairment		$ 8.3

- Definition

The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale).

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